The 5.7x28mm Barrel and BCG Kit allows you to build an AR in 5.7x28mm using CMMG’s patented Radial Delayed Blowback operating system. Unlike typical direct blowback systems, Radial Delayed Blowback not only reduces the weight in your BCG but it results in less felt recoil than a straight blowback system. CMMG’s 5.7x28mm Barrel and Bolt Kits are designed to work with either a CMMG Mk57 lower receiver or with a standard AR15 lower receiver (when using CMMG 5.7 AR Conversion Magazines).

TECH SPECS:
CALIBER: 5.7x28mm
BARREL: 8” 1:9 Twist, Medium Taper 416SS
MUZZLE: threaded 1/2-28
GAS PORT LOCATION: N/A
FINISH: Salt Bath Nitride
Patented Radial Delayed Blowback
WEIGHT: 1lb 10oz

All Products come with CMMG’s Lifetime Quality Guarantee

ALL NFA RULES APPLY

Cmmg Mk57 Barrel, 5.7x28mm, 8" Barrel, 1:9 Twist, Black Finish, Includes Bcg, Fits Ar Rifles 57d18b1

Model: Mk57
Product Type: Barrel
Finish/Color: Black
Fit: AR Rifles
Accessories: BCG
Caliber: 5.7X28MM